Gage for watch-glasses and grooves and fillets.



A. GUERINEAU. GAGE FOR WATCH GLASSES AND GROOVES AND FILLETS.

APPLICATION FILED 00T.7,1908.

. Patented Apr. 27, 1909.

J/WEA JE onus urn: 60.. wuumarcu. n! c.

ANTONIN GUERINEAU, OF SECONDIGNY, FRANCE.

GAGE FOR WATCH-GLASSES AND GROOVES AND FILLETS.

Specification of Letters Patent.

Application filed October 7, 1908.

Patented April 27, 1909.

Serial No. 456,671.

To all whom it may concern:

Be it known that I. ANTONIN GUERINEAU, a citizen of the French Republic,residing at Secondigny, France, have invented new and usefulImprovements in Gages for Watch- Glasses and Grooves and Fillets, ofwhich the following is a specification.

The present invention relates to a gage for measuring watch-glasses andthe grooves and fillets so that the number of the glass can beimmediately found by measuring the groove.

The instrument, which forms the object of this invention, saves muchtime which at present is lost by trying the watch-glasses and preventsthe breaking ofi of the edge of the glasses.

In the annexed drawings the gage is shown by way of example.

Figure 1 is a side view of the gage seen from the side which presentsthe grooves for measuring the glasses. Fig. 2 shows the other side ofthe gage. Fig. 3 is a longitudinal section through the head part of theinstrument.

The gage a which has the form of tongs, comprises two jaws l) and cwhich are made of superposed steel plates fixed by means of rivets orcast in one piece. The jaws have projections d and cavities e which canbe produced by engraving. The projections (Z are are shaped and formsteps; they are beveled so as to well penetrate into the grooves. Thejaws b and c are connected by means of an axle f serving as pivot, eachjaw having an arm and h respectively. The arm 9 carries a sea e i thegraduations of which correspond to 1 10 of a millimeter, the other arm72, terminates in an indicator h The arm g has a spring 9 which servesfor maintaining the tongs closed.

To find out the proper number of a watchglass for a watch, theprojections (Z of the gage are inserted into the groove of the watchuntil the proper size of the groove has been ascertained. The number ofthe glass is in dicated on the jaw and the fractions are inclicated onthe scale. In inserting the proper watch-glass into the correspondingcavity of the gage one can find out at once whether the glass is of theproper size or not. The numbers on the jaws (Figs. 1 and 2) are 1/10 ofa millimeter and the indications upon the scale represent the fractionsbetween the indications marked upon the jaws.

I claim A gage for watch-glasses and the groove of a case center of awatch consisting of tongs comprising two pivoted arms formed at one endwith jaws having arc sha ed projections on one side and are shapediollows on the other side, the projections servin for measuring thegrooves and the hollows ior measuring the watch-glass, a scale at theother end of one arm and an indicator at the corresponding end of theother arm moving over said scale, substantially as described and for thepurpose set forth.

ANTONIN GUERINEAU.

\Vitnesses:

JOSEPH DEBORDES, HENRI Bon'r'ronna.

